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From: "mail at milianw dot de" <sourceware-bugzilla@sourceware.org>
To: elfutils-devel@sourceware.org
Subject: [Bug libdw/25173] New: dwarf_getsrc_die fails for rust code
Date: Thu, 07 Nov 2019 19:25:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25173

            Bug ID: 25173
           Summary: dwarf_getsrc_die fails for rust code
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libdw
          Assignee: unassigned at sourceware dot org
          Reporter: mail at milianw dot de
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

In hotspot/perfparser I notice that we fail to find srcfile information via
`dwarf_getsrc_die` for a given address. To reproduce, eu-addr2line can be
compared to addr2line from binutils:

```
$ cat main.rs=20
fn main() {
    println!("Hello, world!");
}

$ rustc main.rs
$ objdump -S ./main
...
00000000000227f0
<_ZN4core3fmt3num53_$LT$impl$u20$core..fmt..UpperHex$u20$for$u20$i32$GT$3fm=
t17hd6956218784a7031E>:
   227f0:       48 81 ec 88 00 00 00    sub    $0x88,%rsp
   227f7:       48 89 f0                mov    %rsi,%rax
   227fa:       8b 0f                   mov    (%rdi),%ecx
   227fc:       4c 8d 84 24 88 00 00    lea    0x88(%rsp),%r8
   22803:       00=20
   22804:       45 31 c9                xor    %r9d,%r9d
   22807:       66 0f 1f 84 00 00 00    nopw   0x0(%rax,%rax,1)
...
$ addr2line -e ./main -a 227f0
0x00000000000227f0
/rustc/9fda7c2237db910e41d6a712e9a2139b352e558b//src/libcore/fmt/num.rs:142
$ eu-addr2line -e ./main -a 227f0
0x00000000000227f0
??:0
```

I have zero experience with rust and too little understanding of DWARF stil=
l to
know what the exact reason here is. It would be great if elfutils could sup=
port
rust here too like binutils does.

--=20
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